Ten measurements of the steam rate (in pounds per hour) of a distillation tower were used to construct the following normal probability plot (“A Self-Descaling Distillation Tower,” Chemical Engineering Process [1968]: 79–84). Based on the plot, do you think it is reasonable to assume that the normal distribution provides an adequate description of the steam rate distribution? Explain.

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Observation 1800+ 1500 1200: 900 Normal -1.60 -0.80 0.00 0.80 1.60 2.40 score